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Compounds and Mixtures. Compounds and Mixtures DifferencesMoleculesSeparationPlastics Chemical And Physical Changes.

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Presentation on theme: "Compounds and Mixtures. Compounds and Mixtures DifferencesMoleculesSeparationPlastics Chemical And Physical Changes."— Presentation transcript:

1 Compounds and Mixtures

2 Compounds and Mixtures DifferencesMoleculesSeparationPlastics Chemical And Physical Changes

3 Elements A substance that is made up of only one type of atom

4 Iron Particles – An element Key: strong bonds between iron particles one iron particle iron particles held together by strong bonds

5 iron particles iron particles are attracted to a magnet iron particles diagram

6 Sulphur particles - Molecule Key: strong bonds between sulphur particles one sulphur particle sulphur particles held together by strong bonds

7 sulphur particles sulphur particles are not attracted to a magnet sulphur particles diagram

8 iron particles sulphur particles

9 A mixture of iron and sulphur particles strong bonds between sulphur particles strong bonds between iron particles

10 A mixture of iron and sulphur particles A magnet attracts the iron particles but not the sulphur particles. The mixture is separated mixture diagram

11 To form a compound we heat the mixture Heat

12 one sulphur particle one iron particle strong bonds between iron and sulphur particles A compound between iron and sulphur particles

13 A chemical change means a new substance is made A compound between iron and sulphur particles The magnet cannot separate iron and sulphur particles in a compound

14 Mixtures and Compounds MixtureCompound Two or more elements mingled together Elements chemically bonded together Can be separatedVery hard to separate Same properties as parts New properties of it’s own

15 Salt Sodium (Na) Explodes in water Chlorine (Cl) Poisonous gas Sodium Chloride(NaCl) Table salt It’s own properties

16 Mixture and Compounds Mixtures – Two or more elements mingled together Compounds- Two or more elements BONDED together. Element Mixture Compound Compound/ Element mixture Element Mixture

17 Which is it? Element Compound Mixture

18 Molecules Two or more atoms BONDED together

19 Plastics Literally means easy to change shape. Water proof and easy to shape. Mostly made out of oil. The poly in their names means POLYMER.

20 Properties of Plastics Easily Moulded and Coloured Does not rot or rust Not heavy for it’s strength Good Insulators of heat and electricity Non-biodegradable still here in years Monomers small molecules that can be joined together Polymer is a large molecule made of a chain of smaller molecules

21 Monomers small molecules that can be joined together. Polymer is a large molecule made of a chain of smaller molecules

22 Physical Change Nothing new made Easy to reverse Example Melting Ice

23 Chemical Change In this type of change a new substance is produced It is hard to reverse Example Burning of wood or this from the internetthis from the internet

24 Make a table EventChemicalPhysical Ice Melting  Wood Burning 

25 ..\..\Neil Work\reversible_p1_1.gif

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29 reactants = product g Original mass = g Final mass Conservation of Mass

30 In a reaction no new mass is made

31 Elements A substance that is made up of only one type of atom

32 Compounds and Mixtures Differences Compounds Joined together Molecules Separation Compounds Hard to separate Plastics Monomers And polymers Chemical And Physical Changes

33 Summary Elements are…made up of one atom Compounds are made up of 2 or more elements bonded together (they have their own properties) A physical change is reversible and nothing new is made Plastics are made of long chains of monomers and are made of oil. Mass is conserved in all reactions

34 H/W P 175 Q 1,2,5,7,8,9


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